US4517741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Knife with plural replaceable blade storage and means for single blade extension
Assignee: UNIQUE KNIFE MANUFACTURING CORP A CORP OF NEW JERSEY
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Filing: 1982-05-19
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Granted: 1985-05-21
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Expires: 2002-05-19
Abstract
Abstract A knife having generally thin, relatively inexpensive and replaceable blades which can be extended from the handle when the knife is to be used and can be retracted when the knife is to be stored, the knife having a cavity in the handle for receiving a stack of the blades, a slide having a magnetic face for engaging and sliding the innermost blade into extended position and for retracting the blade into the handle and a lock for locking the blade extended.
Inventors
- 👤 James M. Castelluzzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:53
CPC Classifications
B; B26; B26B; B26B5/00; B26B5/001
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
170 words
A utility knife having a handle, a recess in the handle for receiving a stack of knife blades, a knife blade guide in said handle parallel to said recess for receiving a knife blade from said recess, said guide having an opening in one wall thereof for guiding a received knife blade from said recess to a knife end of said handle, magnetic means for attracting at least an innermost blade of said stack of knife blades into alignment with said knife blade guide and for holding said innermost blade in such alignment, and follower means slidable in said handle parallel to said blade guide, means for sliding said follower means in said blade guide, said follower means including means for engaging and sliding said innermost blade of said stack of knife blades in said handle along said knife blade guide and for projecting the end of said innermost blade at the knife end of said handle and means for locking the blade in a projected position in said handle.
Claim 2
Dependent Claim
170 words
A utility knife having a handle, a recess in the handle for receiving a stack of knife blades, a knife blade guide in said handle parallel to said recess for receiving a knife blade from said recess, said guide having an opening in one wall thereof for guiding a received knife blade from said recess to a knife end of said handle, magnetic means for attracting at least an innermost blade of said stack of knife blades into alignment with said knife blade guide and for holding said innermost blade in such alignment, and follower means slidable in said handle parallel to said blade guide, means for sliding said follower means in said blade guide, said follower means including means for engaging and sliding said innermost blade of said stack of knife blades in said handle along said knife blade guide and for projecting the end of said innermost blade at the knife end of said handle and means for locking the blade in a projected position in said handle.
Claim 3
Dependent Claim
49 words
A utility knife, as recited in claim 1, in which said locking means includes means for releasing said locking means from said engaged and projected blade so that said blade can be retracted into said handle by said follower means or can be removed and ejected from said handle.
Claim 4
Dependent Claim
27 words
A utility knife, as recited in claim 2, in which said locking means includes a slide movable longitudinally of said handle for locking and releasing said blade.
Claim 5
Dependent Claim
62 words
A utility knife, as recited in claim 2, in which said locking means includes a slide movable longitudinally of said handle and a lock movable vertically in said handle into and out of engagement with said blade in said guide, said longitudinally movable slide engaging and vertically moving said lock to engage and disengage said blade as said slide is moved longitudinally.
References Cited (Backward Citations)
US2172072A
Cited
US2967354A
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US3577637A
Cited
US3660896A
Cited
US3708881A
Cited
US4005525A
Cited
US4242795A
Cited
US4277888A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |